High-precision U-Pb zircon ages for explosive volcanism calibrating the NW European continental Autunian stratotype

Pellenard, Pierre; Gand, Georges; Schmitz, Mark D.; Galtier, Jean; Broutin, Jean; Steyer, Jean‐Sébastien

doi:10.1016/j.gr.2017.07.014

Cited by 48 publications

(66 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Permian amphibolite‐ to granulite‐facies metamorphism associated to ductile, extensional, shearing in the lower crust may be interpreted either as recording the collapse of the Variscan belt following its crustal thickening during the Carboniferous or may be related to an independent process overprinting the Variscan belt. In the Variscan belt, the transition from the latest Carboniferous (“Stephanian”) to the earliest Permian (Autunian: Pellenard et al, ) is associated with a drastic change in the tectonic setting. Propagation of thrusting and development of the associated foreland basins ceases abruptly (in less than a few million years) at about 305–300 Ma, and numerous fault‐bounded basins develop all over the Variscan belt, combining transcurrent and normal faulting.…”

Section: Discussionmentioning

confidence: 99%

“…As pointed out by Bussy et al (), “Permian events are hardly recorded in the External Massifs.” Indeed, Permian magmatism (strictly speaking younger than 295 Ma) is almost absent in the External Massifs (Figure and Tables S5 and S6). In a few cases (e.g., the Allevard sandstones, in the eastern part of the Belledonne massif; Barféty et al, ; Corsin & Tobi, ; Liard, ), some red to green sediments associated with or stratigraphically overlying Late Carboniferous black sediments have provided paleofloras indicating transitional Carboniferous to Permian ages (“Autunian”; Pellenard et al, ). Significant Permian sedimentation is only found south and southeast of the Argentera massif (e.g., Barrot dome; Faure‐Muret, ).…”

Section: Permian Magmatism and Sedimentationmentioning

confidence: 99%

See 1 more Smart Citation

Pre‐Alpine (Variscan) Inheritance: A Key for the Location of the Future Valaisan Basin (Western Alps)

2018

View full text Add to dashboard Cite

The boundary between the Helvetic and the Penninic (=Briançonnais) Zones has long been recognized as a major fault (“Penninic Front”) in the Western Alps. A narrow oceanic domain has been postulated at least along part of this boundary (the Valaisan Basin). However, the information provided by the pre‐Triassic basement has not been fully exploited and will be discussed here in detail. The igneous and metamorphic history of the pre‐Triassic basement shows significant differences between the External Massifs from the Helvetic Zone, with abundant Late Carboniferous granites, and the basement of the Briançonnais Zone, including the Internal Massifs (Dora‐Maira, Gran Paradiso, and Monte Rosa), devoid of Carboniferous granites. A major coal‐bearing basin, the “Zone Houillère,” opened along this boundary. This limnic intramontane basin has never been properly investigated. The Zone Houillère is not comparable with the external, paralic, flexural, basins on both sides of the Variscan belt but shows similarities with the Saar‐Saale Basin. Like the latter, we interpret the Zone Houillère as a transtensional basin opened along a major, crustal‐scale, fault zone, namely, the East Variscan Shear Zone. The Permian magmatism and sedimentation displays contrasting distributions, being absent or very localized in the Helvetic Zone, and widespread in the Penninic Zone. The above data indicate that the structural inheritance from the Variscan belt plays a major role in defining the future location of the Valaisan Basin, that is, the boundary between the European paleomargin and the Briançonnais microcontinent.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Permian Magmatism and Sedimentationmentioning

confidence: 99%

Pre‐Alpine (Variscan) Inheritance: A Key for the Location of the Future Valaisan Basin (Western Alps)

2018

View full text Add to dashboard Cite

show abstract

“…The age is also in very good agreement with regional biostratigraphical correlations of the Rothenburg and Siebigerode formations with other continental basins within the European Variscides (e.g., Schneider & Scholze, ; Schneider & Werneburg, ). The depositional ages of these correlative strata have subsequently been constrained in several basins by high‐precision U‐Pb chemical abrasion ID‐TIMS zircon dating on volcanic and volcaniclastic deposits (Autun basin, France—Pellenard et al, ; western and central Bohemian basins, Czech Republic—Opluštil, Schmitz, Cleal, & Martínek, ; Boskovice basin, Czech Republic—Opluštil et al, ; and Intra‐Sudetic basin, Czech Republic—Opluštil, Schmitz, Kachlík, & Štamberg, ).…”

Section: Discussionmentioning

confidence: 99%

An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation

Drost

Chew

Petrus

et al. 2018

Geochem Geophys Geosyst

View full text Add to dashboard Cite

We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating of carbonates based on selection and pooling of pixels from 2‐D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples with complex geological histories. Key major and trace elements that are sensitive to detrital components, postformational fluid ingress, mineralogical changes, or diagenetic overprinting are measured along with the Pb and U isotopic data. Laser sampling is undertaken along successive linear rasters that are compiled into maps using the Monocle add‐on for Iolite, with one pixel in the map corresponding to one time slice of the time‐resolved signal. These element, element ratio, and isotope ratio maps can be overlain over photomicrographs or scanning electron microscopy images to spatially link compositional data to textural and structural features. The pixels corresponding to likely homogeneous age domains can be isolated by applying appropriate selection criteria (e.g., Th < 0.3 ppm, Mg/Ca < 0.004) and pooled into pseudo‐analyses using a proxy for the parent/daughter ratio (e.g., 207Pb/235U, 238U/208Pb) to retrieve the largest possible spread of the data points on isochron diagrams. The approach is best suited for analytical setups capable of rapidly or simultaneously scanning over a large mass range and can yield a precision of ±1% or better on quadrupole instruments depending on U concentration, 238U/204Pb, and age of the sample. The sample‐specific filtering criteria for selection and rejection of data and their rationale can be reported, resulting in more transparency with regard to data processing.

show abstract

“…Correlating these units to the International Carboniferous to Permian Stratigraphic Chart is therefore challenging. The acquisition of isotopic ages from interbedded volcanic ash layers have provided a chronostratigraphic framework for several basins in France (Bruguier et al, A C C E P T E D M A N U S C R I P T 5 2003, for the south of the Massif Central, and more specifically: for the Lodève Basin; Pellenard et al, 2017 for the Autun Basin), and in the Czech Republic (Opluštil et al, 2016a(Opluštil et al, , 2016b(Opluštil et al, , 2017. However, chronostratigraphic data are still lacking for many other Carboniferous-Permian basins.…”

Section: Introductionmentioning

confidence: 99%

Sedimentology and U-Pb dating of Carboniferous to Permian continental series of the northern Massif Central (France): Local palaeogeographic evolution and larger scale correlations

Ducassou

Mercuzot

Bourquin

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

show abstract

High-precision U-Pb zircon ages for explosive volcanism calibrating the NW European continental Autunian stratotype

Cited by 48 publications

References 51 publications

Pre‐Alpine (Variscan) Inheritance: A Key for the Location of the Future Valaisan Basin (Western Alps)

Pre‐Alpine (Variscan) Inheritance: A Key for the Location of the Future Valaisan Basin (Western Alps)

An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation

Sedimentology and U-Pb dating of Carboniferous to Permian continental series of the northern Massif Central (France): Local palaeogeographic evolution and larger scale correlations

Contact Info

Product

Resources

About